Thanks for all of the comments and suggestions. - Make the disk on Linux read only – this worked, and was easy. - Copy the disks of interest so I had write access to a copy. This worked, and was easy. - Use the zPDT command *awsmount 0ac5 -m /mnt/zimages/zOS/A4USR1 –readonly* . This worked and was easy. - Update the Hardware Configuration Definition (HCD) to make a disk read only. I could define it, but not activate it because this read-only support is for PPRC mirrored disks. I could not vary the address online. Getting this to work was an interesting exercise, which I have blogged <https://colinpaice.blog/2021/07/15/can-i-define-a-disk-read-only-to-z-os/> .
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